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#1
07-17-2007, 07:16 PM
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cycling compressor
I have never noticed my compressor cycling ever in my 420sel. Today I noticed it would cycle on and off as I was idling. Are they supposed to cycle, or is that an early symptom of worse to come?
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1984 300SD Orient Red/ Palomino 1989 560SEC 2016 Mazda 6 6 speed manual 1995 Ford F-150 reg cab 4.9 5speed manual 
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#2
07-18-2007, 03:36 PM
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Must not be too important then.
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1984 300SD Orient Red/ Palomino 1989 560SEC 2016 Mazda 6 6 speed manual 1995 Ford F-150 reg cab 4.9 5speed manual
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#3
07-18-2007, 06:14 PM
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They only cycle off when the evaporator is close to freezing up. Normally they do not cycle.
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I got too many cars!! Insurance eats me alive. Dave 78 Corvette Stingray - 3k 82 242 Turbo Volvo - Manual - 270k 86 300e 5 speed manual - 210k 87 420sel - 240k 89 560sl - 78k 91 420sel - 205k 91 560sel - 85k 94 GMC Suburban - 90k 97 Harley Davidson Heritage Softail - 25k 00 GMC Silverado 1 ton 30k
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#4
07-24-2007, 09:39 PM
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are the vent temps supoosed to be close to the temp of the evaporator?
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1984 300SD Orient Red/ Palomino 1989 560SEC 2016 Mazda 6 6 speed manual 1995 Ford F-150 reg cab 4.9 5speed manual
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#5
07-24-2007, 10:01 PM
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Quote:
The more it cycles, the better it is working. When it turns off, it has reached a temp at the evap below which the evap will freeze. If it is cycling on and off quickly, the charge is probably low.
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2012 E350 2006 Callaway SC560
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#6
07-24-2007, 10:07 PM
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ive only noticed it do that on a cool day.
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1984 300SD Orient Red/ Palomino 1989 560SEC 2016 Mazda 6 6 speed manual 1995 Ford F-150 reg cab 4.9 5speed manual
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#7
07-24-2007, 11:16 PM
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It will typically cycle more at highway speeds and less (or none) at idle.
It will be more likely to cycle on a cool day as yours did, because the evaporator has to take away less heat. BTW, the AC does not add cold to the air, it removes heat from the air, the heat being the energy that must be moved.
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2012 E350 2006 Callaway SC560
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#8
07-24-2007, 11:36 PM
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so is there a magic number for all a/c systems that the air coming from the vents dont get any colder? Say can a mercedes blow out 38 degree temps and a ford blow out 20 degree temps only because the ford has a better design or would they both just reach maximum cooling at the same temp?
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1984 300SD Orient Red/ Palomino 1989 560SEC 2016 Mazda 6 6 speed manual 1995 Ford F-150 reg cab 4.9 5speed manual
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#9
07-25-2007, 12:22 AM
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Quote:
go to an auto parts store and buy a vent thermometer. put a given amount of water in a container and place in feeezer. get it near freezing - slushy mixture. take it out and drop the the vent thermometer in the slushy solution and let the reading drop. there's and adjustment on the back of the face. maybe an 8mm or so wrench will loosen it. turn and set to 32 degrees; then drop it back in the slushy mix and ensure it reads 32 degress after it's been in there awhile. this is how some hvac guys calibrate their vent temp thermometers. drive your car 'til it's cooled down with a vent thermometer installed. record temp. all of this is just to provide you with a vent temp. you'll also need pressure gauges for your vehicle. different types avail. for r134a and r-12. buy whichever you have, then buy "automotive air conditioning basic service training manual" by mastercool, inc. read every page 3 or 4 times. "learn" the principles of a/c before doing real work. consult this forums search facility. read any/everything on the a/c subject written by arthur dalton. a member here named "jcyuhn" has done a fair amount of serious a/c work and has written/contributed to many good a/c threads. i would search out his posts as well. low refrigerant is not always the problem. sometimes over-charge is the culprit. people go to places like autozone and buy those all-in-one kits thinking "more is better" and away they go. arthur dalton's posts will point out key areas to check before doing anything else. there's more to it than just shooting refrigerant into a system and i'm not accusing you of holding this belief, just making a point.
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Mike Murrell 1991 300-SEL - Model 126 M103 - SOHC "Fräulein" Last edited by Mike Murrell; 07-25-2007 at 12:31 AM.
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#10
07-25-2007, 12:25 PM
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??? Cycling of the compressor has nothing to do with stabilization of engine vibration.
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08 W251 R350 97 W210 E320 91 W124 300E 86 W126 560SEL 85 W126 380SE Silver 85 W126 380SE Cranberry 79 W123 250 78 W123 280E 75 W114 280
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#11
07-25-2007, 04:12 PM
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Well i calibrated my thermometer and took the car for a test run on the highway. i got 45degrees at 60mph. This is enough to keep on comfy when it's 80degrees outside, but well see at 100 or 95 here in Texas.
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1984 300SD Orient Red/ Palomino 1989 560SEC 2016 Mazda 6 6 speed manual 1995 Ford F-150 reg cab 4.9 5speed manual
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#13
07-25-2007, 04:33 PM
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sometimes there are a few, sometime I cant see any at all.
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1984 300SD Orient Red/ Palomino 1989 560SEC 2016 Mazda 6 6 speed manual 1995 Ford F-150 reg cab 4.9 5speed manual
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